UI Design - COLIN Filing (Non-MVP) - Cancel Registration

Create pages to capture the workflow for a Cancel Registration filing
Update Ledger Entries
Update (if needed) the email templates for the results letter.
Update the Corporate summary page

Outputs include:
Receipt

Requirements are located here: https://docs.google.com/document/d/17y385S9oTqxELiMJkNGInt2YE2Nb_GIb/edit#

Screenshots of the steps in Colin can be found here: https://docs.google.com/document/d/1yB9gEaMBhbc-Eh4MRKG8CnIBxuK8tJId/edit

Start by reading the linked requirements and Colin screenshots, then locate the existing filing workflow and related ledger, email-template, and corporate-summary entry points. Done means the Cancel Registration pages are implemented, required ledger and summary changes are present, result-letter templates are updated if needed, and a receipt is produced.

Written by the indexing model from the issue text.